/*
 * Copyright (c) 2015, Cloudera and Intel, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. licenses this file to you under the Apache License,
 * Version 2.0 (the "License"). You may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for
 * the specific language governing permissions and limitations under the
 * License.
 */

package com.cloudera.oryx.app.batch.mllib.kmeans;

/**
 * Evaluation metrics for k-means clustering.
 */
public enum KMeansEvalStrategy {

  /* Sum of Squared Errors, default */
  SSE,

  /* Davies Bouldin Index, lower is better */
  DAVIES_BOULDIN,

  /* Dunn Index, higher is better */
  DUNN,

  /* Silhouette Coefficient, Range is [-1,1], 1 being the best, -1 the worst */
  SILHOUETTE,

}
